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Long-range orthogonal frequency division multiplexing (OFDM) acoustic communications is demonstrated using data from the Kauai Acomms MURI 2008 (KAM08) experiment carried out in about 106 m deep shallow water west of Kauai, HI, in June 2008. The source bandwidth was 8 kHz (12-20 kHz), and the data were received by a 16-element vertical array at a distance(More)
Sparse channel estimation algorithms are proposed for underwater acoustic Orthogonal Frequency Division Multiplexing (OFDM) communications in time-varying multipath channels. Following carrier frequency offset (CFO) correction, the proposed algorithms first extract the portion of the time domain signal corresponding to pilot symbols. The Matching Pursuit(More)
During a recent long-range acoustic communication experiment carried out in deep water, multi-carrier Orthogonal Frequency Division Multiplexing (OFDM) communication signals were transmitted with a 50 Hz bandwidth (225-275 Hz) at various source-receiver ranges from 100 to 700 km. The experiment consisted of two mobile components: (1) a source towed slowly(More)
— The MIMO single relay channel consists of a transmitter, a relay, and a receiver, all equipped with multiple antennas, located in an environment with distance-dependent path loss as well as scattering. We describe an optimal and a heuristic algorithm to solve the spatial energy allocation problem for the MIMO single relay channel when the scattering(More)
This paper presents an online 3D modeling and tracking methodology that uses aerial photographs for mobile augmented reality. Instead of relying on models which are created in advance, the system generates a 3D model for a real building on the fly by combining frontal and aerial views with the help of an optical sensor, an inertial sensor, a GPS unit and a(More)
Orthogonal frequency division multiplexing (OFDM) communications in the presence of motion is investigated using data collected from the Kauai Acomms MURI 2008 (KAM08) experiment, conducted off the western side of Kauai, Hawaii, in June-July 2008. The experiment involved a vertical array moored in 106 m deep shallow water and a source towed at a speed of 3(More)
Aldose reductase (EC 1.1.1.21) is implicated in the pathophysiology of diabetic complications. In this paper we determined the activities of aldose reductase and ATPases of the erythrocytes in 17 patients with Type 2 (non-insulin-dependent) diabetes mellitus (NIDDM). In the aldose reductase assay we used fluorometric method to avoid the disturbance of(More)
—A nonblocking photonic switch can be used to implement a tapped delay line with a large number of adaptive weights and a wide range of time delays. An advantage of using optical tapped delay lines for adaptive filtering is that the operating frequency can be quite high, in the 10–100 GHz range. We present a sparse reconfigurable adaptive filter (SRAF)(More)
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